Drum-brake.



W. S. HUTCHINSON DRUM BRAKE.

APPLICATION FILED AUGA, 191.5

Patented ul 25,1916.

S. HUTCHINSON, OF OYSTER BAY, NEW YQRK. i

WILLIAM Tod-all m fi ality concern I 7 1i; p Be it known that I, VILLIAM S. HUTCH11\1- son, a citizen of the United States, and a. resident of Oyster Bay, Nassau county, New

York, have inyented'a new and .useful. lin provementv in Drum-Brakes, of which the following is a' fullycle'ar, and exact 'descrip-a tion.

My invention though obviously thebrakecan be -'used,on

- any vehicle or inconnection with any rotary member which it is desired tolbrak'e,

"an exceedingly simple and strong brake The object of my invention is to produce mechanism which'can'be applied readily. -to

the rim'ofanoi dinarydrum, and is constructed and arranged so that whenian inner shoe with which the drum is fitted vfrictionally engages the rimysuch frictional inner faces which c on verge toward each other forming essentially a V shaped groove in the inner face of each block, and have an abutment which-is. preferably a roller in the V of the block or member, and so when. the

shoe contacts with the drum rim and is moved .4 with the latter in either direction, it-will I cause the inclined face of the block or memher attached tothe shoe to ride upon the stationary abutment and so force the shoe firmly against the rim ofthe drum. -'This will be understood clearly from the descripi tion which follows.

Reference is to be had'to theaccompanv;

ing drawings forminga part of this specification, which similar reference charac-. ters indicate corresponding parts in all the,

views. I Figure 1 is a cross section through the axle of a Wheeled vehicle having the usual form of drum and'shows the brakemecha-f relates to improvements 1 drum brakes and especially to brakes of this character which are applied to automobiles,

DRUM-BRAKE.

Specification of Letters Patent. Patented J 1y 25, 19116, Application filed August 4, 1915. Seria1No.43,691i

inism in elevation, and Fig. 2 is a broken sec- .tion at right angles to the'view illustrated in Fig. 1.

The drum 10 can be of'any usual or preferred construction; and has a' rim 11 of the usual type, and Ihave'shown a drum rigidly connected with the hub 12.0-fthe vehicle wheel, the hub having the customary connection with the axle 13. All this, however, has nothing to do with my invention, which relates to the means for bringing a strong brake action against the rim 11 which may be any rotary member whatever.

lVithin the rim llis a shoe 1% which preferably extends over nearly all the inner surface of the rim and is expansible, or at least it has a movement back and forth with re lation to the rim. I prefer to make it of a length to nearly encircle the rim as stated, and to. connect'the adjacent ends of the shoe with an' eXpa-nsible spring 15. A shoe of this kind is also generally provided with a strengthening rib 14.

. The shoe is thrown into frictional engagement'with the rim 11 or removed from such frictional engagement by a'lever mechanism 16. This I do not show or describe in detail, for so far as the purposes of this invention are'concerned, any means can be employed for bringing the shoe into frictional engagement with the rim or for removing it from such engagement.

At intervalson the inner side of the shoe ably straddle the rib 14 and each block has two inclined f'aces18 on the inner side which converge toward each other; and which nor- 14 are blocks'or members 17 which prefer-- inally lie with the apex of the inclinedgroove walls in contact with an abutment 19 which is stationary so. far .as its position is concerned with relation to the rim but which for ease of'oper'ation' is preferably a roller supported. on a stationary bearing. As shown each roller is supported on a stud 20,

and-thelatter is secured to the plate 21 which is arranged opposite the open end of thefd'rum 10. and is supported'on the housing 22 of the axle 13, though it can be supported in any convenient or preferred mancontact with the rim ll, the shoe will start to move with the rim, and this will cause the correspondingly inclined faces 18 0f the It will be seen that when by reason of the lever mechanism .16 or other equivalent mechanism,.the shoe isexpanded so as-to iio positive and frictional engagement with the rim 11, and it will be noticed that this action will occur without regard to the direc tion of rotation of the said rim. It will be seen that this arrangement is of the utmost simplicity and strength,

stance if the inclined faces 18 are relatively sharp, the braking action will be quick but not so strong, while ifthe inclined faces have a slight pitch, the action will be slower but much stronger. It will be further observed that the arrangement of the members 17 and abutments 19 is such that the shoe let is always held in place and in proper relation to the rim 11.

1. A brake comprising a rotatable member, a shoe arranged within and adjacent to said rotatable member,means for moving the shoe into and out of frictional engagement with said rotatable member, a block on the shoe thinnest near its central portion and with oppositely inclined faces converging toward such central portion, and a stationary abutment opposite and in contactwith the inclined faces. I

2. A brake comprising arotating mem' ber, an expansible' shoe substantially concentric with said member and Within the same, means for expanding and contracting the shoe, blocks spaced apart .on the inner portion of the shoe, said blocks being thinned near the central part and having oppositely inclined faces converging toward said central part, and abutments having fixed relation to the shoe rim and arranged and that any desired b'aking effect can be had. For inp to extend opposite the inclined faces of the opposite said inclined faces.

4:. A brake comprising a rotatable member, an expansib'le shoe substantially concentric with and lying within said member, means for expanding and contracting the shoe, blocks secured to the shoe andhaving inner inclined faces,the faces of each block converging toward the shoe, and rollers supported by stationary supports and lying oppositeth inclined faces of the several blocks.

A brake comprising a rotatable member a shoe arranged withinthe said memher and having an inclined plane on the back thereof, and a roller mounted on a stationary support and lying opposite said inclined plane.

6. A brake comprising a rotatable member, a shoe arranged Within the said member and'adapted to frictionally' engage said member, inclined planes of opposite pitch arranged on the inner or back part of the shoe, and roller abutmentson stationary supports opposite said inclined planes.

WARREN B. HUTCHINSON, ARTHUR G. DANNELL. 

